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.\"     $OpenBSD: gethostname.3,v 1.18 2001/01/21 23:30:04 aaron Exp $

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.Dd June 4, 1993

.Dt GETHOSTNAME 3

.Os

.Sh NAME

.Nm gethostname ,

.Nm sethostname

.Nd get/set name of current host

.Sh SYNOPSIS

.Fd #include 

.Ft int

.Fn gethostname "char *name" "size_t namelen"

.Ft int

.Fn sethostname "const char *name" "size_t namelen"

.Sh DESCRIPTION

The

.Fn gethostname

function returns the standard host name for the current

processor, as previously set by

.Fn sethostname .

The parameter

.Fa namelen

specifies the size of the

.Fa name

array.

If insufficient space is provided, the returned name is truncated.

The returned name is always null terminated.

.Pp

.Fn sethostname

sets the name of the host machine to be

.Fa name ,

which has length

.Fa namelen .

This call is restricted to the superuser and

is normally used only when the system is bootstrapped.

.Sh RETURN VALUES

If the call succeeds a value of 0 is returned.

If the call fails, a value of \-1 is returned and an error code is

placed in the global variable

.Va errno .

.Sh ERRORS

The following errors may be returned by these calls:

.Bl -tag -width Er

.It Bq Er EFAULT

The

.Fa name

or

.Fa namelen

parameter gave an invalid address.

.It Bq Er EPERM

The caller tried to set the hostname and was not the superuser.

.El

.Sh SEE ALSO

.Xr hostname 1 ,

.Xr getdomainname 3 ,

.Xr gethostid 3 ,

.Xr sysctl 3 ,

.Xr sysctl 8 ,

.Xr yp 8

.Sh STANDARDS

The

.Fn gethostname

function call conforms to

.St -xpg4.2 .

.Sh HISTORY

The

.Fn gethostname

function call appeared in

.Bx 4.2 .

.Sh BUGS

Host names are limited to

.Dv MAXHOSTNAMELEN

(from

.Ao Pa sys/param.h Ac )

characters, currently 256.

This includes the terminating NUL character.

.Pp

If the buffer passed to

.Fn gethostname

is smaller than

.Dv MAXHOSTNAMELEN ,

other operating systems may not guarantee termination with NUL.